package com.cdh.server.config.filter;

import org.springframework.security.access.AccessDecisionManager;
import org.springframework.security.access.AccessDeniedException;
import org.springframework.security.access.ConfigAttribute;
import org.springframework.security.authentication.AnonymousAuthenticationToken;
import org.springframework.security.authentication.InsufficientAuthenticationException;
import org.springframework.security.core.Authentication;
import org.springframework.security.core.GrantedAuthority;
import org.springframework.stereotype.Component;

import java.util.Collection;

/**
 * @author by cdh
 * @description:权限控制-判断用户角色
 * @Date: Created in 15:41 on 2021/4/21
 */
@Component
public class CustomUrlDecisionManager implements AccessDecisionManager {

    @Override
    public void decide(Authentication authentication, Object o, Collection<ConfigAttribute> configAttributes)
            throws AccessDeniedException, InsufficientAuthenticationException {
        for (ConfigAttribute configAttribute : configAttributes) {
            // 当前url所需角色
            String needRole = configAttribute.getAttribute();
            // 判断角色是否登录即可访问的角色，此角色在customFilter中设置
            if ("ROLE_LOGIN".equals(needRole)){
                // 判断是否登陆
                if (authentication instanceof AnonymousAuthenticationToken){
                    throw new AccessDeniedException("尚未登录，请登录");
                }else {
                    return;
                }
            }

            // 判断用户角色是否为url所需角色
            Collection<? extends GrantedAuthority> authorities = authentication.getAuthorities();
            for (GrantedAuthority authority : authorities) {
                if (authority.getAuthority().equals(needRole)){
                    return;
                }
            }
        }
        throw new AccessDeniedException("权限不足，请联系管理员!");
    }

    @Override
    public boolean supports(ConfigAttribute configAttribute) {
        return false;
    }

    @Override
    public boolean supports(Class<?> aClass) {
        return false;
    }
}
